The baby is one of Robbie Rotten's disguises often seen in one of the disguise machine's chambers, but never actually worn.
The baby costume has been seen and rejected in the following episodes:-
- Defeeted, rejected for being "too puny" in favour of Rob U. Blind.
- Rockin' Robbie, rejected for being "too... new" in favour of Johnny B. Badd.
- Little Sportacus, rejected without comment in favour of a purple bush.
- The baby costume is apparently available in different sizes.
- In the Defeeted episode, it only comes up to Robbie's chest.
- In the Rockin' Robbie episode it seems to be around a foot shorter than the other disguises.
- In the Little Sportacus episode it is the same height as the others.
|Seson one: Rob U. Blind | Lazycus | The mailbox | Robbie's softball uniform | Sherlock Foams | Sportacus | The Birthday Fairy | Scotty the Scoutmaster | Dr. Rottenstein | Rottenbeard | The Dinosaur | Sir Rottenham of Robbington | The Rotten Kid | The gorilla suit | Soccerbot | Miss Roberta | Fordmil Meansbad | Santa Claus | The purple cow | Giant fruit and veg | Zobby|
|Season two: Johnny B. Badd | A purple bush | The Trash Man | Mayor Meanswell | The Ghost | The Snow Monster | Roberto the Great | The Shaking Cup operator | Rob R. Robley | The Purple Legend | Chef Robert | The gorilla suit (again) | Prof. H.R. Rottennen | The sticker vendor | The construction worker | Bob Wire | The Big Bad Wolf | Robbie's racing outfit | Sully Swingahip|
|Others: The aristocratic dress | The baby | The blue dress | The chicken | The court jester | Cowman | The crusader | Robbie's dressing gown | The nightgown and headdress | The silk clown | The white robe|